diff --git a/src/OAuth2/ResourceServer.php b/src/OAuth2/ResourceServer.php
index 2da1103c..2f7ef991 100644
--- a/src/OAuth2/ResourceServer.php
+++ b/src/OAuth2/ResourceServer.php
@@ -6,6 +6,7 @@ use OutOfBoundsException;
 use OAuth2\Storage\SessionInterface;
 use OAuth2\Storage\SessionScopeInterface;
 use OAuth2\Util\RequestInterface;
+use OAuth2\Util\Request;
 
 class ResourceServer
 {